| What IF HR Ltd | Information & communication | 2020 |
| Wheatus Limited | Administrative & support | 2015 |
| Which Renewable Solutions Ltd | Professional & scientific | 2025 |
| Whimbrel Software Ltd | Information & communication | 2002 |
| Whisky Solutions Ltd | Wholesale & retail | 2022 |
| White Castle Estates Ltd | Real estate | 2021 |
| White House Business Investments Limited | Construction | 2003 |
| White Lizard and Co Limited | Real estate | 2022 |
| Whitehorse Cleaning Ltd | Administrative & support | 2018 |
| Whites Building Contractors Limited | Construction | 1997 |
| Whole Psychology Limited | Health & social care | 2015 |
| Whyte Rock Consulting Ltd | Construction | 2025 |
| Whytleaf Grill & Bar Ltd | Hospitality | 2021 |
| Wicked & Wonderful Chocolatier Ltd | Manufacturing | 2018 |
| Wicken Green Limited | Real estate | 2016 |
| Wild Card Collective Ltd | Arts & recreation | 2023 |
| Wild-West-Cornwall Camping Limited | Hospitality | 2023 |
| Wildfitness Limited | Administrative & support | 2019 |
| Windridge Property Investments Ltd | Real estate | 2021 |
| Wingate Benefit Solutions Limited | Financial services | 2011 |
| Wingate Financial Planning Limited | Financial services | 2011 |
| Wingate Holdings Limited | Financial services | 2002 |
| Wingate Wealth Management Limited | Financial services | 2008 |
| WIP Construction Ltd | Construction | 2024 |
| Wise Cycles Limited | Other services | 2021 |
| Wittdeer Limited | Hospitality | 2021 |
| Woldingham Financial Services Ltd | Financial services | 2010 |
| Woldingham School | Education | 2008 |
| Wolla Ltd | Real estate | 2024 |
| Wood House Wealth Limited | Professional & scientific | 2016 |
| Woodgrove Holdings Limited | Financial services | 2024 |
| Woodland Partners Limited | Administrative & support | 2019 |
| Woodside Timber Group Ltd | Financial services | 2023 |
| Words and Pixels Limited | Information & communication | 2013 |
| Wren Interior Solutions Limited | Extraterritorial | 2016 |
| WSD (Gratton) Limited | Real estate | 2017 |
| WSD (Lancaster) Ltd | Real estate | 2019 |
| WSD Cornwall Ltd | Real estate | 2019 |
| WSD Lancs Ltd | Real estate | 2020 |
| Wychwood Studio Ltd | Professional & scientific | 2024 |
| Wynmillman Ltd | Hospitality | 2016 |
| X-Cite Engineering Consultancy Limited | Professional & scientific | 2022 |
| X-Met Security Services Ltd | Administrative & support | 2019 |
| XA Engineering Ltd | Manufacturing | 2023 |
| Xander Surveying Limited | Professional & scientific | 2020 |
| Xanderjet Ltd | Professional & scientific | 2024 |
| Xavier Lorraine Properties Ltd | Real estate | 2024 |
| Xtra Reps Ltd | Wholesale & retail | 2023 |
| Yabundu Admire Limited | Real estate | 2019 |
| YBR Properties Ltd | Real estate | 2020 |
| YCM (UK) Limited | Wholesale & retail | 2014 |
| Yellowblue Immigration Ltd | Professional & scientific | 2025 |
| YLG Holdings Limited | Financial services | 2019 |
| YLS Properties Ltd | Real estate | 2020 |
| YM Motors Ltd | Wholesale & retail | 2020 |
| Youngwood Limited | Administrative & support | 2005 |
| Your Social Siren Ltd | Professional & scientific | 2025 |
| Yourears Limited | Wholesale & retail | 2025 |
| Yourrecruit (Caterham) Ltd | Administrative & support | 2016 |
| Yourrecruit (IT) Limited | Administrative & support | 2011 |
| Yourrecruit (UK) Limited | Administrative & support | 1995 |
| Yourrecruit Group Limited | Financial services | 2016 |
| Yourrecruit Limited | Administrative & support | 2010 |
| Z6 Solutions Limited | Information & communication | 2016 |
| Zanoogo Ltd | Manufacturing | 2024 |
| Zapilates Limited | Arts & recreation | 2022 |
| ZEN Web Studios Ltd | Information & communication | 2024 |
| Zenith Therapy Limited | Health & social care | 2024 |
| Zephyrus Construction Ltd | Construction | 2018 |
| Zerin Drury Art Limited | Arts & recreation | 2017 |
| Zettapro Limited | Information & communication | 2013 |
| Zhiwar Sparkle Cleaning Services Ltd | Administrative & support | 2024 |
| ZN Fish and Chips Limited | Hospitality | 2024 |
| Zone Construction Consultancy Ltd | Professional & scientific | 2021 |
| ZTW Property Services Ltd | Real estate | 2019 |
| Éternelle Events & Decor Hire Ltd | Other services | 2025 |